CG Interview Graphics Question

Question 1

What is computer graphics ?

Answer 1

CG Involves display, manipulation, storage of images and experimental information for proper visualization.

Question 2

What are properties of video display device ?

Answer 2

Persistence, resolution and aspect ratio

Question 3

Write the essential applications of computer-graphics ?

Answer 3

1. 3d modeling
2. CAD software
3. entertainment such as animated movies and video games
4. Data visualization through graphs in statistics
5. To communicate information effectively.

Question 4

Difference between vector and rastor scan ?

Answer 4

1. randomly traverses || sequentially traverses
2. expensive || less expensive
3. easy to modify || hard to modify
4. hard to fill sollid || easy to fill solid
5. refresh rate depends on resolution || doesn’t
6. Incorporates beam penetration|| shadow mask

Question 5

What is aspect ratio

Answer 5

ratio of length to width

Question 6

advantage and disadvantage of dda

Answer 6

advantage :
1. It is easy to understand and straight forward algorithm
2. easy to implement

disadvantages :

1. dda is time consuming (specially for sign() function)
2. accuracy is poor

Question 7

What are advantages and disadvantages of bresenhams line algorithm

Answer 7

advantages :

1. efficiency
2. predictable and reliable
3. suitable for hardware implementation

disadvantage :

1. Limited to straight line
2. Aliasing suffering
3. Limited to 2d

Question 8

what is translation ?

Answer 8

translation is used to an object by repositioning it along a straight line path from one co-ordinate point to another.

Question 9

what is reflection ?

Answer 9

transformation produces mirror image
it is created relative to an axis of reflection by rotation objects 180 degrees about reflection axis.

Question 10

what is shearing

Answer 10

the transformation which distorts shape of object such that had been caused to slide over each other is known as shearing

Question 11

what is viewing transformation

Answer 11

The mapping of component of a world-coordinate scene to device coordinates is called a viewing transformation.

Question 12

define clipping and clip window ?

Answer 12

any method that identifies those portions of a display that are either inside or outside of a particular region of space is referred to as clipping algorithm.

Question 13

what is meant by adressability ?

Answer 13

It is number of particular dots per inch (d.p.i) that can be developed.

Question 14

what is scan-code ?

Answer 14

when the key is pressed on the keyboard, the keyboard auditor places a code import to the key pressed into a part of memory called a keyboard buffer. This code is known as scan-code.

Question 15

3D viewing devices ?

Answer 15

1. Stereoscopic Systems
2. Virtual Reality Systems

Question 16

What is projection ?

Answer 16

The process of displaying 3D into a 2D display unit is called a projection.

Question 17

what is rasterization

Answer 17

the phase of determining the appropriate pixels for representing images or graphics object is called rasterization.